System Structure

An operating system is usually large and complex. Therefore, it should be engineered carefully. Possible ways to structure an operating system:
- Simple, single-user, MS-DOS,MacOS, Windows
- Monolithic, multi-user, UNIX,Multics, OS/360
- Layered,T.H.E. operating system
- Virtual machine, IBM VM/370
- Client/Server (microkernel), Chorus/MiX

Figure 1.15: OS Structures, MS-DOS, Unix, IBM VM/370, Chorus

$\includegraphics[scale=0.5]{figures/structuremsdos.ps}$	$\includegraphics[scale=0.5]{figures/structureunix.ps}$
$\includegraphics[scale=0.5]{figures/structureibm.ps}$	$\includegraphics[scale=0.5]{figures/structurechorus.ps}$

2004-05-25